Prime Day 2018 is here and retailers are knocking hundreds off electronics and accessories (including Apple devices) for the big event. We're rounding up a list of the best deals on and off Amazon -- and updating it throughout the day.

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Amazon's annual Prime Day sale is set for July 16, which despite its name will actually run for 36 hours starting at 3 p.m. Eastern time. Historically, Apple products themselves haven't gone on sale, but this can be a ripe opportunity for people with Prime memberships to pick up related accessories and peripherals.

Users looking to consolidate all of their legacy music purchases in a single cloud-based service will have one less option come mid-January, as Amazon has announced it will discontinue its song matching and uploading capability.

On a recently updated document, Amazon has retracted claims that 5.1 sound is available in the early versions of the Amazon Prime Video app for the Apple TV, and that live streaming of Amazon channels and Thursday Night Football has limitations.

Customers hoping to get an Apple TV 4K before Christmas have one less option, as Amazon completely sold out of the set-top box only hours after it began sales of the device, reflecting years of demand that grew from a dispute between the two companies.

Apple has gone all-in on promoting the new Amazon Prime Video app, and is not only telling users that it is available after a tvOS 11.2 update, but has taken out Twitter "promoted" tweets noting it as well.

Though owners of an ultra-high definition 4K TV set with high-dynamic range will get full visual fidelity from Amazon's newly released Prime Video app for Apple TV, the sound quality won't match that best-in-class experience, as it is apparently limited to 2.1 channels at launch.

Six months after being announced, Amazon Prime Video for Apple TV has debuted on the tvOS App Store, meaning subscribers will be able to view hits like "The Man in the High Castle," "The Big Sick," "Catastrophe," and "The Grand Tour" on Apple's latest set-top boxes.